Dutch round goby discovery

This video says about itself:

First recorded video of spawning by invasive Round Goby under laboratory conditions. The eggs can bee seen at the top of the nest (pale white area). The male (darker fish) can be seen courting the female (pale fish). The female is seen inverting to deposit eggs on the ceiling of the nest.

Translated from J. Kranenbarg, of the Dutch RAVON ichthyologists:

Round goby found in polder

Message issued by Stichting RAVON on Wednesday, June 8, 2011

The round goby is one of the exotic fish species which since a few years live massively in the landfill stone banks of the rivers and associated waters. Recently, during a fishing party of RAVON for the first time ever round gobies have been found in a polder area. This suggests that the round goby habitat in the future will extend further from the large rivers to smaller waters.

Originally, the round goby (Neogobius melanostomus) lives in river basins in the Ponto-Caspian region around the Black and Caspian Sea and the Sea of Azov. In 2004, it was found for the first time in the Netherlands in the Lek river near Schoonhoven. Currently, the round goby lives in all major rivers and has reached very high densities near stone banks.

On May 13, three juvenile round gobies were found in a polder near Tiel. In previous investigations by the Polder Fish Working Group of RAVON, round gobies had not been found. However, the western tubenose goby, another exotic species from the Ponto-Caspian region, did occur then.

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